Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

English definition of “air sac”

air sac

noun [C]     specialized
a space filled with air that continues from a bird's lungs into one of its bones or another body area , used in breathing Substances and structures in the bodyThe respiratory system a wide part like a bag in the tubes an insect uses for breathing Substances and structures in the bodyThe respiratory system an alveolus (= a very small air bag in the lungs )Substances and structures in the bodyThe respiratory system
(Definition of air sac noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of air sac

Translations of “air sac”

Word of the Day

drizzle

to pour liquid slowly over something, especially in a thin line or in small drops

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More